For each document, we create (or modify) at least one node that keeps track of this "edge"

track_edge.js

{
  "_id" : "12478",
  "value" : {
    "pg" : (1 / NUM_OF_AIRPORTS_IN_DB),
    "prs" : {
      "12892" : (NUM_OF_FLIGHTS_FROM_12478_TO_12892 / NUM_OF_FLIGHTS_FROM_12478),
      ...
   } 
 }
}